LAUSR

Introduction/Background The scoliosis is a deformation of the spine which muscular component is both little known in the determinism of the pathology as in its evolution during the growth. After a conservative treatment, it is important to estimate the residual scoliosis but also the muscular capacity of the spine. The objective of this study is to estimate the strength and the power of the trunk muscles by isokinetic dynamometer for teenagers treated orthopedically for idiopathic scoliosis. Material and method Monocentric and retrospective study made from 2015 to 2017 within the framework of a global assessment of the spine in 1 year of the definitive ablation of the brace. The evaluation was realized on the Cybex isokinetic dynamometer on a population of 50 scoliotic female patients. The flexor and extensor spinal muscles were explored in a concentric way in 60, 90 and 120°/s speed. The isokinetic results were analyzed according to the type of scoliosis and according to the angulation. Results The 14–16-year-old group is the most represented with 40 patients. For this group, we have a majority of thoracic and lumbar scoliosis (17 of every). In global analysis, the scoliotic patients present lower MFM than the control group, for three speeds, and the F/E ratio is increased. The power is the parameter, which is the most impacted by the scoliosis. The MFM has decreased, the ratios of MFM have increased, the power is strongly lower than the asymptomatic group; the ratio of power has increased. Conclusion The presence of the scoliosis is systematically associated with a decrease of strength of the flexor and extensors muscles of the spine. Afterward, one must study the implication of the orthopaedic treatment on the spinal muscular weakening by comparing the population studied for this work with a similar population, but untreated orthopedically.